<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区 -->
            <div class="avatar_box">
                <img src="../assets/login.png" alt="头像">
            </div>
            <!-- 表单区 --->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" type="password" prefix-icon="iconfont icon-3702mima"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetloginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 登录表单的数据绑定对象
            loginForm: {
                username: 'admin',
                password: '123456'
            },
            // 表单验证规则
            loginFormRules: {
                username: [
                    { required: true, message: '请输入登录名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入活动名称', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods: {
        resetloginForm() {
            this.$refs.loginFormRef.resetFields();
        },
        login() {
            this.$refs.loginFormRef.validate(async valid => {
                if(!valid) return;
                const { data: res } = await this.$http.post('login', this.loginForm);
                if(res.meta.status !== 200) return this.$message.error('很遗憾登录失败!');
                this.$message.success('恭喜你登录成功!');
                // 1. 将登陆成功之后的 token 保存到客户端的sessionStorage中
                //  1.1 项目中出了登录之外的其他API接口， 必须在登录之后才能访问
                //  1.2 token 只应在当前网页打开期间生效， 所以将token 保存在sessionStorage中
                window.sessionStorage.setItem('token', res.data.token);
                // 2. 通过编程式导航跳转到后台主页， 路由地址为home
                this.$router.push('/home')
            })
        }
    },
}
</script>

<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}
.login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: relative;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
        position: absolute;
        left: 50%;
        top: -50%;
        transform: translate(-50%, 50%);
        height: 130px;
        width: 130px;
        border: 2px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        background-color: #fff;
        img {
            height: 100%;
            width: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns {
    display: flex;
    justify-content: flex-end;
}

</style>